Across
1
Blocking of light by a celestial body
4
Positive particle in nucleus
5
Amplified beam of light
6
Infectious microscopic agent
8
Compound containing oxygen
Down
2
Curved glass that refracts light
3
Force that attracts objects together
4
Glass that splits light into spectrum
7
Second lightest element
9
Measure of matter in an object
10
Unit of energy
11
Particle of light